The figure shows surface XY separating two transparent media, medium–1 and medium–2. The lines ab and cd represent wavefronts of a light wave travelling in medium–1 and incident on XY. The lines ef and gh represent wavefronts of the light wave in medium–2 after refraction 
(i) Light travels as a
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(i)
Wavefronts (Normal to rays) are parallel. So rays should also be parallel.
(ii) c and d are at same wavefronts
So, φ C = φ d
and φ e = φ f
∴ φ d – φ f = φ c – φ f
D is incorrect
φ d – φ c = 0
φ f – φ e = 0
So both should be equal.
(iii) Ray is bending towards normal.
So, medium 1 should be rarer and medium 2 should be denser.
So, V 1 > V 2 .
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